Cuba is republic led by President Fidel Castro, who is Chief of State, Head of Government, First Secretary of the PCC, and commander in chief of the armed forces. Many aspects of Cuban life are controlled through the Communist Party and its affiliated mass organizations, the government bureaucracy, and the state security apparatus. The Ministry of Interior is the principal organ of state security and control.

Although the constitution theoretically provides for independent courts, it explicitly subordinates them to the National Assembly and to the Council of State. The People's Supreme Court is the highest judicial body. Due process is often denied to Cuban citizens, particularly in cases involving political offenses. The constitution states that all legally recognized civil liberties can be denied to anyone who opposes the "decision of the Cuban people to build socialism."

The Communist Party is constitutionally recognized as Cuba's only legal political party. The party monopolizes all government positions, including judicial offices. Though not a formal requirement, party membership is virtually a de facto prerequisite for high-level official positions and professional advancement in most areas, although non-party members are sometimes allowed to serve in the National Assembly.